Caster



Feb. 20, 1923. 1,445,914

S. SCHIFF- (EASTER.

FILED JUNE 3.1919.

' I Inventor Q5 A norms] Patented'heh. 20, 1923.

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sic-mum sci-1121 on crnorivnari, OHIO.

(EASTER.

Application filedlune 3,

To (all whom it may concern:

Be liLkIlO'WD that l, SIGMUND iicrirrr, a

native of Hungary, and resident of Cincinwvherein the direction of travel may easily be changed by swivel means and the ObJGC/h of my intention to provide a caster which shall, be simple in construction,easily as},

scmbled', easy of operation yet strong and durable to withstand the strains of heavy service without breakage. To accomplish this object I have invented a novel construc-.

tion which I have illustrated in the drawings and particularlypointed out in the claims.

A. novel feature of my invention is to have the antifriction means carry the load stresses, dispensing with holding means such a rivets or screws to hold the caster elements together. v

A- second feature of my invention is the means I employ to promote easy swiveling which consists in placing the wheel axcs outside the circle of antifriction balls. Bythis means the wheels yield more readily to changes of direction of travel.

A third feature is the means I employ for dividing the load and transmitting one half thereof to each wheel alike. Where the floor is uneven one wheel may drop into arecess and thus be lower than the other. The U shapedstirrup serves to transmit the load equally under such circumstances by tilting slightly without afiecting the upright position of the stem.

In the drawings Figure 1 is a vertical section of my caster; Figure 2 is an elevation of the same; Figure 3 is a cross section along the line AA of Figure 1. In the drawings 1 represents a portion of a structure to which the caster may be applied, being secured thereto by suitable bolts 2. These bolts should be used in sutlicient numbers to firmly secure the caster. 3 represents the bowl which, in its preferable form, is pressed from sheet metal and its shape is shown in Figures 1 and 3. The bottom of said bowl is cut out at 4: to permit the stem 5 to extend therethrough without frictional contact with said bowl; The upper part of said stem 5 is provided with a head 6 having an annu lar recessed surface 7. Metal antifriction balls 8 surround the head 6 and the surface isle. serial/no. 301,517.

of said head is of such shape as to fit the curve of the balls. The annular ring 10 is formed inane Y into shape to lit the balls. When the stem and balls are placed into the bowl, the ring 10 is pressed tightly into the upper partof 1.

the bowl to keep the stem, balls and bowl togetherduring shipment and storage. 1 he stem 5 ispro-vided with a squarehole, 9 The axle 11 extends loosely through this hole and has suspended from it the U shape S'iZlPIilifi'lQ. The axle 11 has a square cross sect-ion between the wheels and the square 5 hole inthe stirrup 12 prevents theaxle from turning. Two wheels are mounted on the axle, one on each side of the stirrup and are kept on the axle by suitable washers 13and' cotterpins 14;. When the load is appliedfl to the caster it ist-ransmitted through the. bails, stem and stirrup, 1n succesion to the-i axle" and wheels. As the axes of the.

wheelsare outsidelthe" circle of the-balls aps plying the load tips the stem 5 to an angular position caused by thetendency of the wheels toroll in the direction'of the oflsetof the stem. This tipping tendency of the stem is but slight as theballs arrest further tendency to tip. By this construction the bowl stem and balls are held together in operative assembly without the use of a central or pivotal bolt. q The bolts marked 2 in Figure 1 serve a twofold purpose, first to hold the caster to the structure to which it is to be applied and second, to hold the caster ole ments from becoming disassembled while in use. It may also be noted that whilethe stem is in the center of the axle the load is delivered to the axle at points adjacent to the wheels, where the axle is less likely tobend under the load.

Having described my invention what I claim as new and desire to secure by Letters Patent is 1. A caster comprising a bowl, a stem extending within the bowl, a' series of balls surrounding and supporting the stem, a horizontal axle carrying a pair of wheels, a stirrup mounted upon said axle between; the wheels, and arranged tosupport thestem at a point directly beneath the said axle.

2. In a caster the combination of a bowl, adapted to accommodate a series of antifriction balls upon its inneredge, a ring seated upon the bowl adjacent thev top there of, a stem extending into the bowl and having an -annular recessed surface formed upon said stem interiorly to. the bowl,- antig lie 5916 the 111g; h i in men s, e upon said axle he '16 wheels and adapted to engage the drical be? *ing snrtaee on the support the stem below isi g a imwlu a slotted the bowl, a series of axle extending thru the slot in the stem eno oarryi a pair 0" vheels, and a stirrup mounted on the axle between the wheels and supporting the stem.

5. A cester comprising howl slotted stem extending Within the bowl, a series of balls surrounding supporting the stem, an axle extending thru the slot in the stem and carrying a pair of Wheels, and a stirrup mounted upon said axle between the ading and supporting the stem) wheels and arranged to support the stem at a point directly beneath the said axle.

(3. A center comprising a bowl a slotted stein extending Within the bowl and having an extended semi-cylindrical surface formed thereon exteriorly t0 the bowl, a series of balls surrounding and supporting the stem, an axle extending thru the slot in the stem and carrying a pair of Wheels, and a stirrup mounted upon the axle between the Wheels and adapted to engage the extended evlindrical hearing on the stem and to thereliy support the stem.

'11 A caster oon'iprisinga howl a slotted stein extending Within the bowl and hailing an extended semi-cylindrical bearing surformed thereon exteriorly to the bowl, a series of balls surrounding and supporting the stem, a U shaped stirrup having slotted arms, the stem extending between the arms oi the stirrup and engaging the central portion of such stirrup an axle extending thru the slots in the arms and the stem, and Wheels mounted on the axle immediately adjacen the stirrup arms.

SIGMUND SCHIFF.

Witnesses: v

D. K. ALLISON, WM. HUS/r. 

